Drafting instrument



March 25, 1958 R. F. MONTAVON ET AL DRAFTING INSTRUMENT 5 Sheets-Sheet 1 Filed Sept. 26, 1955 Robert F. Monfavon Adrian K6. Shon INVENTORS 9 BY and March 25, 1958 h. F. MONTAVON ET AL ,7

DRAFTING INSTRUMENT 3 Sheets-Sheet 2 Filed Sept. 26, 1955 lll'lllllifllllllIII/ll! 7 I1,115,155,175 "it E.

Robert F. Mom'avon Adrian 7. 6. .S/mn

INVEN TORS.

BY 3M3 M r h 2 1 R. F. MoNTAvoN ET AL 2,827,702

(DRAFTING INSTRUMENT Filed Sept. 26, 1955 Haber! F. Man/awn Adrian Y. 6. $170!;

INVENTORS.

WWW EH 5 Sheets-Sheet 3 Unite Z,i2?,?2 Patented Mar. 25, 1958 DRAFTING INS'IRUNIENT Robert F. Montavon, Venice, and Adrian Santa Monica, Calif.

, Application September 26, 1955, Serial No. 536,618

Y. C. Shon,

2 Claims.

drafting instrument primarily adapted for use as an ellipsograph but which may be utilized as a compass, divider, T-square and line guide for setting lines in various angular relations and which is adjustable in all of its uses.

. A further object of the present invention is to provide a drafting instrument generally employing a rectangular plate having crossed central slots therein together with movable pegs mounted in said slots wherein the pegs are adjustably interconnected by a rod that is provided with a" marking device for marking a piece of paper in accordance with the movement of the pegs within the slots.

' Still another important object of the present invention is to provide a drafting instrument in accordance with the preceding objects in which the plate is supported in spaced relation to a supporting surface and in which the pegs and marking device are removable for use as a divider or compass when desired.

Yet another important feature of the present invention is to provide a drafting instrument conformable to the preceding objects in which angular portions are provided on the plate for marking angular lines together with a protractor and means for supporting the plate for movement to form a guide for a plurality of parallel lines.

Other important objects of the present invention will reside in its simplicity of construction, bility for its various purposes, utility, adjustabilit-y, efliciency of operation and its'relatively inexpensive 'manufacturing cost.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure l is a top plan view of the drafting instrument of the present invention;

Figure 2 is a side elevational view of the construction of Figure 1;

Figure 3 is a plan view of the plate member of the present invention being utilized with the supporting rollers mounted thereon for drawing a series of parallel lines;

Figure 4 is a detail sectional view taken substantially upon a plane passing along section line 44 of Figure 3 illustrating the mounting means for the roller supporting rods;

Figure 5 is a detail sectional view taken substantially upon a plane passing along section line 55 of Figure 1 illustrating the mounting means for the supporting legs on the fiat plate; 7

Figure 6 is an enlarged perspective view illustrating the hinge connection for the depending legs to permit folding thereof; I 1

Figure 7 is a detail sectional view taken substantially ease of adapta upon a plane passing along section line 7-7 of Figure 1 illustrating the mounting of one of the depending pegs in the slot;

Figure 8 is a perspective view illustrating the adapter that is slidably received in the slot in which receives the mounting means for the pegs;

Figure 9 is an exploded group perspective view of the mounting means for retaining the marking instrument on the end of the interconnecting rod between the pegs;

Figure 10 is an exploded group perspective view illustrating the mounting means for the rollers on the ends of the rod when it is utilized alongside the plate; and

Figure 11 is a perspective view illustrating the pegs utilized together with the interconnecting rod for use as a divider or compass.

With reference to the oificial drawings, the numeral 10 generally designates the drafting instrument of the present invention including a generally rectangular and fiat plate 12 having crossed slots 14 and 16 therein which are generally disposed centrally in the plate 12 and extend to the outer edges of the plate 12. The outer ends of the slots 14 and 16 are bridged by interconnecting members 18 for retaining the segments of the plate 12 in planar relationship wherein the interconnecting or joining members 18 rigidly connect the sections of the plate 12. The under edge of the slots 14 and 16 are provided with a recessed portion 20 forming a guide for a purpose described hereinafter.

Secured to the upper edges of the slots 14 and 16 are a pair of facing members 22 provided with depending flanges 24 which extend into-the slots 14 and 16 and form facing members for the slots 14 and 16 thereby preventing wear to the plastic plate 12. Secured in overlying relation to the slots 14v and 16 is a metal guide 26 which define slots 28 in overlying relation to the slots 14 and- 16 and the guides 26 are secured to the plate 12 by the same screw fasteners 36 which secure the facing members 22 thereby forming a unitary assembly wherein the slots 28 in the guides 26 are spaced from the slots 14 and 16 thereby forming the recessed guide 32.

Slidably received within the slots 14 and 16, the slot 28 and the recessed guide 32 is an adapter generally designated by the numeral 34 and including a body portion 36 having an upper projecting flange 38 and a lower projecting flange 44 which generally defines cylindrical areas which are spaced by recesses 42 which are inthe form of slots wherein the slots 42 receive the upper and lower edges of the slots 28 formed by the guides 26 and the flanges 38 and 40 are spaced above and below the edges of the slot 28 thereby providing a slidable adapter 34. The main body portion 36 of the adapter 34 projects downwardly into the slots 14 or 16 and is provided with a vertically extending bore 44 therein. The specific arrangement of the adapter 34 permits sliding movement of the body 36 in one of the slots 14 or 16 wherein the body 36 is held in positive relation to the slots 14 and 16 by the guides 26.

Extending through the longitudinal bore 44 is an elongated threaded member 46 having a cylindrical handle member 48 at its upper end and screw-threadingly engaging a screw threaded bore 50 in the upper end of a depending peg 52 at its lower end. The peg 52 is provided with a transverse bore 54 for receiving an interconnecting rod 56 wherein the threaded member 46 extends into the transverse bore 54 for locking engagement with the interconnecting rod 56 thereby adjustably securing the rod 56 to the pegs 52. The lower ends of the pegs 52 are provided with threaded bores 58 for receiving a screw threaded stud 60 on a removable tapered member 62 having a pointed lower end 64 wherein the pointed member 62 may be removed and placed with another type of fitting if desired. It will be noted that the upper end v 3 of the depending peg52 is slidably received within the recess at the lower edge of the slots 14 and 16 on the plate 12 wherein the pegs 52 will be guided during movement along the slots Hand 16.

The upper end of the handle 4,8 is provided with a.

blind threaded bore 66 receiving a screw threaded stud 68 of a fitting 70 having a transverse bore. 72 therein receiving an interconnecting rod '74 which is. generally parallel to the'interconnecting rod,56. J'It will be noted that the interconnecting rod" 74 is disposed above the plate 12 and the interconnecting rod 56 is disposed below the plate 12 specifically, as illustrated in Figure 7 of the ofdcialdrawings; V

fit willbe understood that an adapter'34 with its associated depending'peg 52 is mounted in-ea'chof'the slots 14 and 16"for 'movement'therein. V

Atone freeend of the interconnecting rod 56 is a'ghinge joint" including a pair of'furcations76 on the rod 5.6 for receiving therebetween .a projecting lug 78011 a threaded stud 80 wherein the lug78 is. connected to the tunations 76 by a hinge pin 82. A screw'threaded sleeve 84 is in. threaded engagement with the threaded stud '80 and retained thereon by a suitable setscrew 86. The lower endof the sleeve 84-is provided with inwardly extending slots-8S wherein the sleeve 84 telescopically receives a projecting rod 90' on the upper end of a pen '92 wherein the rod 90' is provided with an inwardly extending slot-94 wherein the rod 90will'be frictionally retained in the sleeve 84 wherein the slots 88 and 94 provide resilient frictiona-l interengagement between the sleeve184 and therod 90. e

The pen 92 is in the form of a'conventional drafting ink penas illustrated but it willbe understood that any suitable marking device such as a pencil or the like may be employed wherein the particular fitting permits easy detachable engagement of 'thejmarking pen 92. I

'Ext'endingoutwardly between the joining members 18 at each end-ofcachslo't14-and 16 is'a baror'rod 96 haw ing itsinn'er endsecuredto-the plate 12 by a screw threaded fastener 98 having a wing nut 100 thereon'f'or releasably'and' adjustably securing the rod 96 to the plate 12. The outer end of the rod or flat bar 96 is provided with a twisted end portion 102;that is connected to a twisted end portion 104 of a'dep'ending flat leg 106 by a hinge pin 108 whereby the depending ileg 106 may be disposed in depending and" inwardly extending angular relation to the bar 96' for supporting the plate 12 in spaced relation to 'a supporting surface 110or1may be superimpose'd in the upper vsurface'ofi-thebar 96 in a folded or. collapsed position.

' Disposed along one'sideofthe plate 12'is a pair of clip members 112 -'secured to the-upper'surface thereof by a plurality'ofscrew threaded. fasteners 114 that may be provided with removable nuts 1'16 on theupper surface thereof 'for retaining the clip 112 against the upper surface of the plate 12. The outer end of the clip members 112 is provided with a pair of generally semi-cylindrical portions 118 having a pair ofoutwardly flaredlips' 126 at the outer edges thereof for receiving. the interconnecting rod-56 when all of the dependingpegs 52 have been removed and the legs 108 folded-upwardlythereby permitting the plate 12 to rest against a supportingsurface in a flat and intimate relation. The outer endso'f the rod 56 are provided with a roller 122 that'is knurled on its outer surface 124 and is mounted on abearing '126 havingaperipheral flange 128 onits outer end that is in screwthreaded engagement with the threaded stud 80 on one end of the rod 56 and the threaded portion 130'on' the other endthereof. The bearing-126 'is'provided -with an internal threaded bore 132 for" mounting the roller 1 22' rotatably on the'rod 56. Asillustrated in Figure'4,=theknurled bearing 122 is of such -a diameter to support the adjacent edge of the plate 12 in spaced relation to the supporting surface wherein movement -of the :plate 12 :will

be effected so that the other edges of the plate 12 may'1he i utilized for drawing a plurality of parallel lines or lines in the device may be utilized as a compass by employing the marking device92 and omitting one of the pegs 52.

In using the device as an ellipsograph, the elementsare arranged as illustrated in Figures 1 and 2 wherein the two pegs 52 with the pointed members 64 thereon are adjustedso thaLthe distance between the marking device 92 and the adjacent peg 52 is equal to the semi-minor axis of the desired ellipse. The distance from the marker 92 and the remote pointed member 64 is equal to the semi-major axis of the desired ellipse. The rod 74 is then inserted in the fitting 7.0 .on the top of the handle members 48' and is ,movedina' circular direction wherein the marking' device 92"will scribe the true ellipse with the desired minor and major'axes wherein the peg 52 positioned under the slot 16 Will'move continuously and only within the confines of the slot and'the' peg 52 disposed inthe slot 14will rnove' only'in this particular slot. Of course, the position of the major and minor axes of the ellipse may be varied by ositioning the marking device 92 in the desiredre'lationship to the slots and pegs.

In using the device ,as apair of dividers, the two pointed members .64 may be adjusted on the rod 56 according to the measurements" desired and the handles 48 screwed downwardly until the screw threaded members 46bind therod'56 in the'pegs 52. This facilitated by the fiat portion of the rod 56 facing the inner ends of the screwofany g'ivenradius may be marked wherein the marking device and the center point are always disposed in parallel for forming the truest possible circle. If desired, the rod 74flm'ay be connected onto the end of the rod 56 .by a suitable coupling device for permitting the formation .of larger circles if desired. a

'In using the device as .a parallel line guide, protractor, T-square .orithe like; the rod 56 'isattached' to the plastic sheet IZibyth'e clips 112 wherein the knurled supporting members 122; provide traction so that the sheetor plate 12,1ma'y he pres'sedthe'reon' and moved forward or backa to the exact'construction and operation shown and de- 7 plate and adjustably interconnecting the pegs, a marking Ward with .the'le'ading' edge'of the plate 12 movingjn'a p'os'itio'n parallel to its" former position wherein various parallel lines may be drawn or the device may ,be used "as a: T-square' or .protractor "by using the various angle 3 corners and the.protractor136 on one edge of the plate 12. The foregoing. is considered 'as illustrative only of the principles of :the. invention. Further, since numerous modifications and changes will readily occur. to those skilled-in theart, it is not desired to' limit the invention scribed, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A drafting instrument comprising a. genera plate having crossedcentral slots therein, bridging means at the outer ends "of each slot for rigidly retaining the plate in assembled conditionya pair of depending pegs slidably mounted in said slots, a rod disposed below the device removablymounted' on said rod, and a plurality of depending-legssupporting the platein spaced relation to a-supporting surface whereby the marking device is ar ranged for mar king a paper on the supportingfsur fa ce -when-thepegsare movedin the slots, said marking device beingdisposed' at one end of the rod, said pegsjbeing spaced from each otherand from the marking device with" the distance from the marking device and the adjacent peg being the semi-minor axis of an ellipse and the distance from the marking device to the remote peg being the semi-major axis of an ellipse whereby the marking device will form an ellipse when the pegs are moved in their respective slots, said slots having slot guides mounted therein, an adapter slidably mounted in each of said slot guides, said pegs being mounted on said adapters, a handle mounted above said adapters, a screw threaded member on each of said handles and extending through said adapters into said pegs for releasably locking pegs to the rod, an interconnecting rod slidably supported between said handles for facilitating the movement of the pegs, said legs being mounted in laterally spaced relation to the edges of the plate for increasing the range of movement of the marking device, each of said depending legs including a horizontally extending bar slidably adjustably mounted in one of said slots, and a depending bar swingably connected to the outer end of the horizontal bar for movement about substantially a horizontal axis whereby the depending bar may act as a supporting leg or may be swung inwardly into overlying relation to the horizontal bar thus permitting the plate to be supported in elevated relation to a supporting surface or in engagement with the supporting surface.

2. A drafting instrument comprising a generally flat polygonal plate having crossed central slots therein, removable bridging means at the outer ends of each slot for rigidly retaining the plate in assembled condition, a pair of depending pegs slidably supported in said slots, a rod disposed below the plate and adjustably interconnecting the pegs, a marking device removably mounted on said rod, and a plurality of depending legs supporting the plate in spaced relation to a supporting surface whereby the marking device is arranged for marking a paper on the supporting surface when the pegs are moved in the slots, said marking device being disposed at one end of the rod, said pegs being spaced from each other and from the marking device with the distance from the marking device and the adjacent peg being the semi-minor axis of an ellipse and the distance from the marking device to the remote peg being the semi-major axis of an ellipse whereby the marking device will form an ellipse when the pegs are moved in their respective slots, said slots having slot guides mounted therein, an adapter slidably mounted in each of said slot guides, said pegs being mounted on said adapters, a handle mounted above said adapters, a screw threaded member on each of said handles and extending through said adapters into said pegs for releasably locking the pegs to the rod, an interconnecting rod slidably supported between said handles for facilitating the movement of the pegs, said legs being adjustably mounted in the slots in laterally spaced relation to the edges of the plate for increasing the range of movement of the marking device, said legs being pivotal for movement from the depending position to a position above the plane of the bottom of the plate for permitting the plate to be used as a straight edge marking guide when the pegs are removed.

References Cited in the file of this patent UNITED STATES PATENTS 210,922 Cousins Dec. 17, 1878 532,155 Hottinger Jan. 8, 1895 534,152 Heinkel et a1 Feb. 12, 1895 648,170 King Apr. 24, 1900 873,291 Beck Dec. 10, 1907 1,048,126 Ball Dec. 24, 1912 1,134,806 Barron et al. Apr. 6, 1915 1,332,887 Collins Mar. 9, 1920 1,837,912 Mann Dec. 22, 1931 2,066,384 Bade Jan. 5, 1937 2,106,398 Bartusch Jan. 25, 1938 FOREIGN PATENTS 201,981 Germany Sept. 25, 1908 635,702 Germany Sept. 22, 1936 

